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Structure and Thermoelectric Properties of SrBiTe3; 12-Fold Superstructure Caused by Distortion of the Two-Dimensional Te-Nets

Published online by Cambridge University Press:  10 February 2011

Kyoung-Shin Choi ,
Duck-Young Chung ,
Joy Heising ,
Paul W. Brazis ,
Carl R. Kannewurf  and
Mercouri G. Kanatzidis
Kyoung-Shin Choi
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI, 48824.
Duck-Young Chung
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI, 48824.
Joy Heising
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI, 48824.
Paul W. Brazis
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208.
Carl R. Kannewurf
Affiliation:
Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL 60208.
Mercouri G. Kanatzidis
Affiliation:
Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, MI, 48824.
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Abstract

The ternary compound, SrBiTe3, was prepared by the molten flux method. It crystallizes in the orthorhombic space group Pmmn with a=4.665(2)Å, b=4.517(2)Å, c=16.129Å, and Z=2. The compound is composed of a NaCl-type [Bi2Te4]2- layer and a flat square (Te2)2- net with equal Te-Te distances of 3.24Å. The Sr2+ ions are stabilized between the layers in monocapped square antiprismatic sites. X-ray and electron diffraction studies reveal a 12-fold superstructure due to subtle distortions within the Te net of the compound. The superstructure was refined in the monoclinic space group C2 with a=27.923(5)Å, b=32.228(6)Å, c=4.5069(9)Å, β=90.000(3)°. The compound is a semiconductor with a band gap value of 0.14 eV. It melts incongruently at 613 °C.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 545: Symposium Z – Thermoelectric Materials 1998 - The Next Generation… , 1998 , 117
Copyright
Copyright © Materials Research Society 1999

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References

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